View Compilation Error

0_0_24292384_22648.cpp: In function 'int main()':
0_0_24292384_22648.cpp:14:19: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'
   scanf("%s%s",a,b);
                   ^
0_0_24292384_22648.cpp:14:19: error: cannot pass objects of non-trivially-copyable type 'std::string {aka class std::basic_string<char>}' through '...'